add an (undocumented) feature allowing you to overwrite any build setting in builds that match a given category. TODO: add an entry to the projmods JSON for the user to specify these, rather than calling this function directly.
Merge branch 'feature/overwriteBuildSetting' of github.com:MatthewMaker/XUPorter into feature/overwriteBuildSetting

* 'feature/overwriteBuildSetting' of github.com:MatthewMaker/XUPorter:
  add an (undocumented) feature allowing you to overwrite any build setting in builds that match a given category. TODO: add an entry to the projmods JSON for the user to specify these, rather than calling this function directly.